Compensating means for sole sewing machines



Jne 29, 1948. v pERoslNO 2,444,062

COMPENSATING MEANS FOR SOLE SEWING MACHINES Filed April 16, 1945 2 Sheets-Sheet l ze @f6 www f June 29, 1948. v. PETRosxNo 2,444,062

` I COMPENSATING MEANS FOR SOLE SEWING MACHINES Filed April 16, 1945 2 sheets-sheet :a

INVENTOR pefroJp'o.

gf/Zg-Iv ,gh

Figure 9 is a bottom plan view partly in section of the arcuate slideway in a feed cam lever.

Figure is a perspective view of the gib used in the sli-deway of a feed cam lever.

Referring to the drawings, my invention is shown as applied to a curved needle sole stitching machine in which the work is fed through the machine by the awl. This type of machine is of known construction and in wide use so that a detailed description of its structure is not thought t'o be necessary, and this description will be limited to those parts of the machine with which my improved structure is directly connected.

The various working parts of a machine are supported on the main supporting column I2 by a complicated structure unnecessary to describe, but including a head in which a main drive shaft is rotatably mounted and a forwardly extending shelf or table I3 provided with ways I4 forming a guide I5 in which a feed slide is adapted to reciprocate horizontally. In a sole stitching machine-or this type the work is held in position on a. work table by a presserfoot and is fed by an awl, the operatormerely guiding the edge of the shoe as the sole is drawn by the awl over the work table between it and the presserfoot. A shoe edge guard and an edgegauge which engage the shoe are provided for aiding the operator in properly guiding the shoe as it is advanced through'the machine. All of these parts are of conventional construction and have not been described or illustrated in detail as they form no part of the invention.

A feed slide I6 is provi-ded which consists of a rectangular plate adapted to slide in the guide I5 provided with a rabbeted forward longitudinal edge and an integral vertically extending arm I1 at one end of theplate as seen in Figure v1. The awl which not only perforates the work for the needle but also feeds it forward during the perforating stroke is secured by an awl clamp to an awl holder segment both of known construction which are suitably mounted for angular and linear oscillation upon a horizontally extending stud located adjacent the upper end of the arm I1.

Slide I6 is retained in position for horizontal reciprocatory movement by a fiat rectangular retaining' bar indicated at I S in Figures 1 to 6 and provided with a plurality of vertical apertures IS adjacent its front edge for the reception of stud bolts 2lik which extend through these apertures and are threaded into the top of the table I3 for securing the bar on the table top.

The detailed construction of my improved retaining bar I8 is shown in Figures 2 to 6, inclusive from which it will be apparent that the bar is of elongated rectangular shape and is provid-ed with an elongated cut-out portion 2| along one 0f its edges. This cut-out portion 2l preferably extends inwardly from the lower back edge of the bar for approximately one third its width and has a depth approximately one third the thickness of the bar. A plurality of vertically extending tapped apertures 22 are provided in the bar. along the longitudinal center line of this cut-out vportion '2| for the reception of adjusting screws snugly in the cut-out portion of the bar and provided With countersinkings 21 spaced in aligned relation with the vertical apertures 22 in the bar I8 when the gib is in position in the cut-out portion 2|. When the bar I8 is secured in position on the table I3 by means of the stud bolts 20 its back edge projects Iover the slideway I5 a distance equal to the width of the gib 26 and this projecting portion engages an edge of the feed slide I6 thereby serving to retain the slide in the slideway and guide it as it is reciprocated horizontally so that the head of the arm I1 will move the awl sector backward and forward on the awl shaft and thus move the work in a feeding direction.

In the operation of a machine of this type the feed slide I6 and retaining bar I8 are subject to considerable wear which if not in some way compensated for results in a relatively large amount of vertical play between the moving parts that interferes with the proper coordination and operation of the machine causing increased breakage of awls, needles and needle guides. To be effective the compensating means must be adjustable so that it can be progressively adjusted at intervals as the wear on the parts increases. In my improved mechanism such adjustment is secured through the `radjusting screws 23 which have tapered ends 28 that engage in the countersinkings 21 in the gib 26 and assist in retaining the gib in position. The adjusting screws are locked in position by means of the locking screws 25 threaded into the tapped ends of the transverse apertures 24 and bearing at their inner ends against brass plugs 30 which are thereby forced against the sides of the adjusting screws 23 and lock them in position. In making an adjustment of the gib 26 to compensate for wear the locking screws 25 are first loosened and the adjusting screws 23 then turned down asfar as they will go. They are then backed 'off approximately half a turn and the locking screws 2'5 again tightened. This adjustment will provide sufficient play between parts to permit unimpeded `reciprocation but will not result in the excessive looseness or play between the parts.

The mechanism for driving the feed slide will now be described. Referring to Figure 1 a feed cam lever is indicated at 32 adapted to fulcrum on a vertically extending fulcrum pin 33 which extends through the lever and is suitably secured as by a set screw 34 in one end of a feed cam lever bracket'35 which has its opposite end secured toa xed part of the head of the machine by any suitable means. t A rearwardly extending arm 36 on the feed cam lever 32 has a cam follower roll f 31 on its outer extremity which engages in a .cam groove 38 in a cam 39 mounted on the main drive shaft of the machine so that upon rotation of the drive shaft the feed cam lever 32 is oscillated with a predetermined frequency. Extending forwardly from the feed cam lever 32 is an arcuate channeled arm 40 which forms an inverted arcuate shaped slideway -4I as best seen in Figure 9'in whichl an apertured feed adjusting lever slide block 42 isl adapted to slide. This block forms a part of the operating kconnection about to be describedbetween theY feed cam lever 32 and the feed slide vI6 byV means of which angular oscillation of the formeris translated to linear reciprocation of the feed slide for moving the awl in awork feeding direction.

suitably mounted as by means of la stud 43 on the feedslideN I6 adjacent'the arm I1 islav feed adjusting lever bracket 44 which 'is adjustable by; meansfzoffanfadiustinggscrew '45; This bracket has; a` laterally extending armupon which'on'e endrof a,- feed' adjusting lever- 46- is` pivotallysetcur-ed. Intermediate-the ends `of'thelever. afstud isisecuredl therein which' is adapted tobe pivotally received in' anaperture l1 inthe slidingiblock 42;, asbest seen'- in Figure-9; Thus the portion of the4 leverfdtv between this stud and its' secured end along, with the slide block 42 forrnsanwoper-y ating `connection between thefeed slide lf'and the feed-camrleverf 32. The free end of the lever- Mi,J extends outwardly beyond the arcuate. slide.- way 4l and has a portion 48 yadapted to be gripped by-the hand-lof anwoperator-.and a ratchettpawl 49 for. engaging the teeth of afeedv adjusting ratcliet .50` secured: to theslide I6. By moving the leverJl` along; the ratchet-5l)` the relative-ipo@- sitinn,ofthe slidevblock-42Iin the slidewaylfis' altered `and inthis manner the length of.y the stitch. taken by the` machine mayA be varied. When along stitch is desired, the adjustingflever lili is4 moved to rbring. the slide block 42` close tot theforward .or outer end of the slidewayl4l and properly;J and the accurate:4 adj ustmentZ necessary@I cannotA be secured or maintained if` more thanthe: very'limited predetermined amount: ofplay isr presen-m in: theV parts` which operate: the 4awl. Formerly; this could be remedied onlyl by replacements of some oral-l. of the moving.Y parts.,

such.,` as theV feed slide; feed slide guide, slide block `orfeed cam lever, depending one whichv of these par-tswere worn,` butv this is no `longer l\A necessary. My inventionlnotvonly;saves thecost l do so.

poseiof illustratingthe invention but-it will be` of replacement of these. parts `and much of the; amount formerly spent-on needles, needle. guides andl-awls, ,but-it also saves Amuch' time because theu adjnst'ment:v canber: made very quickly, and it isnotnecessary to-tear down-themachineto Furthermore. my invention is equallyl adaptableto use voninew machinesor onmachines that. have already seen .much service.

Asp,eci1icform of compensating: means has been illustrated. and described herein forr the purobvious thatmodications in they for1'n;..sizeandv arrangement ofipa-rtsmay belmade without` departingfrom the` scope of the invention. which is to be, interpreted` to include all those modifications coming withinV the scope. of` the appended.

claims.

I claim: l p

l.In an .awl feedsole stitching machine hav.- ,ing a work fedingawl horizontally reciprocable 'J `Aby a reciprocating feed slide for.,movingithe` awl approximately. the same height as thedepth. of`

the slideway` il which gib ismounted... on the inner face ofthe outerwall 52 of the twoarcuate walls forming thel slideway Ml andextends from.

end toend of wall 52. This gib l has its ends,

turnedback to form resilientlhooks` as shown at 53,' Land these hooks snap over the ends of the wall 52'to hold the gib 5l inlposition1 The router, wall 52 is provided with tapped apertures lill;` three being shown inv the drawings, fonthere ception ofadjusting screws 55'which are threaded into these aperturesand are lockedin any desired position by means of lock nuts 56. When excessive play developsfbetween` thefslide block 42 and the sides of the arcuate slideway 4I, the lock nutsr` 56 `are loosened and the adjusting screws 55 turned sufficiently to move the gibf'5l1rout far enough to compensate for this play. rIhe lock nuts 56 are then tightened thereby locking thek adjustingscrews 55 in position:` In this Way`,very

small and very'- accurate adjustments may be. made" between these' moving'. parts to preventi.

excessive horizontalplay therebetween.

In feeding work through the machine, the awl makes one complete reciprocatory movement for each stitch taken and during the piercing stroke moves the work forward for the stitch, this feeding movement being imparted to it by the horizontal reciprocation of the feed slide I6 which, in turn, is operated by the oscillating feed cam lever 32 through the feed adjusting lever 46 and slide block 42. It will be apparent that considerable play will soon develop between these moving parts when the machine is in use. Such play, even though slight, is detrimental to the proper operation of the machine because of the close limits between which the awl and needle and needle guide must be adjusted to operate in a work feeding direction andra feed cam.1ever fulcrumed on` saidfmachine for imparting recip rocatory movement to, the feed slide when the; `cam'lever is oscillated by the machinethe combination. comprising, araceway for guiding, the reciprocatory movement .of said feedslidea slider way on said feed cam lever, Ya working` connection operating in part in said slideway for translating the oscillatory movementlofsaid cam lever to reciprocatory movement in said feed. slide, gibs positioned along said raceway andsaidsl-deway` to form a bearing surface betweenthe saineand saidlreciprocating4 and oscillating parts for. sustaining the wear therebetween, resilient means,V

for maintaining. the gib inV the slideway, and. meansv for adjusting said.' gibsA to progressively compensate for. wear. between saidfparts.

2. In an awl yfeedsolestitching maChinehaVing a work feeding awl-horizontally reciprocableby a reciprocating4 feed .slide .for moving the awl l in..

a work feeding. direction and a. feedca-m lever fulcrumed on said machinefor. imparting reciprocatory, movement.. to the. feed! slide. when the. cam lever is oscillatediby` the machine.the. combination comprising afeedslideguide for. guiding.

the reciprocatory movement of said feedslid'e, a bar for retaining Ysaid `:feed slide insaid'guide for reciprocatory movement therein, said bar.` pro,.-

0 vided .with an elongated cut-out. portion, a gib, mountediin the cut-out portion and forming the bearing surface between said feed slide and said retaining bar, a slideway on said feed cam lever, a connection operating in part in said slideway for reciprocating said feed slide when said cam lever is oscillated, a gib positioned along one face of said slideway to form a. bearing surface therein, means for individually and progressively adjusting said gibs to compensate for wear between the moving parts and prevent excessive vertical play between said feed slide and said retaining bar and excessive horizontal play between said slideway and connection, and means for locking said adjusting means.

3. In an awl feed sole stitching machine having a feeding mechanism including a feed slide horizontally reciprocable for moving work in a feeding direction, the combination comprising an elongated bar for slidably engaging said feed slide to hold the latter in position, said bar provided with an elongated cut-out portion, a, gib interposed between said bar and said feed slide and mounted in said cut-out portion, means for adjusting the vertical position of the gib to compensate for wear between said feed slide and said gib and means for locking said adjusting means.

4. In an awl feed sole stitching machine having a work feeding mechanism including a feed slide horizontally reciprocable in a feed slide guide for moving work in a feeding direction, the combination comprising a retaining bar having an elongated cut-out portion in one of the longitudinal edges thereof, a gib in said cut-out portion to form the bearing surface between said bar and said slide, spaced seats in said gib, means for securing said retaining bar over said slide guide to hold said feed slide in position for reciprocation in said slide guide, means for adjusting the vertical position f said gib to compensate for wear between said feed slide and said gib, said adjusting means engaging in said seats for assisting in securing said gib in position, and means for locking said adjusting means.

5. In an awl feed sole stitching machine having a Work feeding mechanism including a feed slide horizontally reciprocable in a feed slide guide for moving work in a feeding direction, the combination comprising an elongated bar secured to said slide guide for retaining said feed slide in said guide in reciprocable relation therewith, said bar having an elongated cut-out portion in one of the longitudinal edges thereof and a plurality of tapped vertical apertures in said cut-out portion of said bar intersected by apertures extending transversely from the front side of said bar, said transverse apertures being tapped for a portion of their length from their outer ends, a gib adapted to be received in said cut-out portion and projecting therefrom to form the bearing surface between said bar and said slide, a plurality of seats in said gib aligned with the vertically extending apertures in said bar, adjusting studs threaded in the vertical apertures of said bar for adjusting the vertical spacing between said bar and said gib, said studs engaging in said seats for assisting in securing said gib in position, loose plugs in the inner ends of said transversely extending apertures and locking screws receivable in the threaded ends of said transversely extending apertures, said screws bearing against said plugs to force said plugs against said adjusting screws for locking the latter.

6. In an awl feed sole stitching machine having horizontally reciprocable means for moving work in a feeding direction and a feed cam lever fulcrumed on said machine and oscillated by a driving cam on said machine for reciprocating said work feeding means, the combination comprising a slideway on said lever, a working connection securedon said feeding means having a part slidable in said slideway, a gib adapted to be secured in said slideway for sustaining the wear between said slideway and said connection, resilient means for securing said gib in position in said slideway, and means for adjusting said gib to compensate for wear and prevent excessive horizontal play between said slideway and connection.

'7. In an-awl feed sole stitching machine having horizontally reciprocable means for moving work in a'feeding direction and a feed cam lever fulcrumed on said machine and oscillated by a driving cam on said machine for reciprocating said work feeding means, the combination comprising a slideway on said lever, a working connection on said feeding means having a part slidable in said slideway, a gib adapted to be secured in said slideway for sustaining the wear between said slideway and said connection, resilient means for securing said gib in said slideway, adjusting screws for adjusting said gib to compensate for wear between said moving parts and prevent excessive horizontal play between said slideway and connection and lock nuts for locking said adjusting screws.

8. In an awl feed sole stitching machine having horizontally reciprocable means for moving work in a feeding direction and a feed cam lever fulcrumed on said machine and oscillated by a driving cam on said machine for reciprocating said work feeding means, the combination comprising an arcuate slideway on saidlever, a Working connection on said feeding means having a part slidable in said slideway, an arcuate gib adapted to be secured in said slideway for sustaining the wear between said slideway and said connection, resilient means for securing said gib in said slideway, adjusting screws in one of the walls of said slideway for adjusting said gib to compensate for wear between said moving parts and prevent excessive horizontal play between said slideway and connection and lock nuts for locking said adjusting screws.

VICTOR PETROSINO.

REFERENCES CITED The foliowing references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 473,870 French et al Apr. 26, 1892 1,086,607 Merrow Feb. 10, 1914 2,313.613 Boillat Mar. 9. 1943 

